Which is cheaper, the Serica Ref. 5303 Diving Chronometer or the Fears X James Porter & Son LE?

At MSRP the Serica Ref. 5303 Diving Chronometer is the cheaper of the two at $1,768, against $3,292 for the Fears X James Porter & Son LE — a $1,524 gap before any retailer discounting.

Which is bigger, the Serica Ref. 5303 Diving Chronometer or the Fears X James Porter & Son LE?

The Serica Ref. 5303 Diving Chronometer wears larger at 39mm versus 38mm for the Fears X James Porter & Son LE — a 1mm difference across the dial.

Which has better water resistance, the Serica Ref. 5303 Diving Chronometer or the Fears X James Porter & Son LE?

The Serica Ref. 5303 Diving Chronometer is rated to 300m versus 10m for the Fears X James Porter & Son LE.

Which has a longer power reserve, the Serica Ref. 5303 Diving Chronometer or the Fears X James Porter & Son LE?

The Serica Ref. 5303 Diving Chronometer carries a 42-hour power reserve against 40 hours on the Fears X James Porter & Son LE.

What movement does the Serica Ref. 5303 Diving Chronometer run compared to the Fears X James Porter & Son LE?

The Serica Ref. 5303 Diving Chronometer runs a automatic caliber (M100 COSC), while the Fears X James Porter & Son LE runs a manual (ETA 7001).

Side by side

Serica Ref. 5303 Diving ChronometervsFears X James Porter & Son LE

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

Serica Ref. 5303 Diving Chronometer

5303-1-diving-chronometer

MSRP $1,768

Fears X James Porter & Son LE

brunswick-x-james-porter-son-limited-edition

MSRP $3,292

At a glance

15 of 29 specs differ

Diameter

Ref. 5303 Diving Chronometer39mm

X James Porter & Son LE38mm

Power Reserve

Ref. 5303 Diving Chronometer42h

X James Porter & Son LE40h

Water Resistance

Ref. 5303 Diving Chronometer300m

X James Porter & Son LE10m

MSRP

Ref. 5303 Diving Chronometer$1,768

X James Porter & Son LE$3,292

Full specifications

Case

6 specs

Crystal & Dial

4 specs

Crystal

Sapphire

Domed Sapphire

AR Coating

Yes

Inner

Dial Color

Enamel Black

x James Porter & Son LE

Lume

Super-LumiNova

None

Movement

4 specs

Caliber

M100 COSC

ETA 7001

Type

Automatic

Manual

Power Reserve

42h

40h

Complications

COSC

None

Pricing

1 specs

MSRP

$1,768

$3,292

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